Hey Dan,
I've been using the 23" Falcon props on my Allure, and with this plane I find that I am using quite a bit more throttle management than I was when I was using the 22" Contra props, and this has resulted in the same, or less, draw from my packs.
I am typically taking about 3200mah - 3600mah for Masters and P17.
However, I also know that all of this probably highly airframe dependent, and if you run the 23" props hard, they are definitely going to pull more from your packs.
Brenner ...